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Ireland and Britain were both separated from the European continent at about this time (c. 12,000 BCE). The first people arrived in Ireland between 7,000-6,500 BCE at Coleraine in the far north. The Mount Sandel Mesolithic Site, discovered at Coleraine in 1973 CE, is the oldest archaeological site in Ireland.
Some of the oldest rocks in the world include the gneiss found in the Minnesota River Valley. The Morton Gneiss, which is 3.6 billion years old, is a coarsely crystalline, foliated metamorphic rock.The texture and mineral assemblage of the Morton Gneiss give clues as to how the rock formed.ome of the oldest rocks in the world include the gneiss found in the Minnesota River Valley. The Morton Gneiss, which is 3.6 billion years old, is a coarsely crystalline, foliated metamorphic rock.